fix: update dependencies to ensure some fixes are included

Signed-off-by: Geert Eltink <geert.eltink@gmail.com>

composer.json

@@ -23,9 +23,9 @@
         "php": "^7.1",
         "dealerdirect/phpcodesniffer-composer-installer": "^0.6.2 || ^0.7",
         "laminas/laminas-zendframework-bridge": "^1.0",
-        "slevomat/coding-standard": "^6.2.0",
-        "squizlabs/php_codesniffer": "^3.5.3",
-        "webimpress/coding-standard": "^1.1.5"
+        "slevomat/coding-standard": "^6.4.1",
+        "squizlabs/php_codesniffer": "^3.5.8",
+        "webimpress/coding-standard": "^1.1.6"
     },
     "autoload": {
         "psr-4": {